In a noninjury, noncontact skid on icy pavement on an empty road, a car spins 1.75 revolutions while it skids to a halt. It was initially moving at 15.0 m/s , and because of the ice it was able to decelerate at a rate of only . Viewed from above, the car spun clockwise. Determine its average angular velocity as it spun and slid to a halt.